National Weather Service issued a flood warning for the Rock River at Rock Valley also for the Big Sioux at Hawarden 
THE NATIONAL WEATHER SERVICE SIOUX FALLS HAS ISSUED A
* FLOOD WARNING FOR
THE ROCK RIVER AT ROCK VALLEY.
* FROM LATE TONIGHT TO THURSDAY MORNING.
* AT 02PM MONDAY THE STAGE WAS 13.24 FEET.
* MODERATE FLOODING IS FORECAST.
* FLOOD STAGE IS 16.00 FEET.
* FORECAST...RISE ABOVE FLOOD STAGE BY 6 AM TUESDAY AND CREST NEAR
17.4 FEET BY TUESDAY MAY 28. THE RIVER WILL FALL BELOW FLOOD STAGE
BY WEDNESDAY MAY 29.
* AT STAGES NEAR 16.0 FEET...SIGNIFICANT AMOUNTS OF AGRICULTURAL
LANDS ARE FLOODED, AND SOME RURAL ROADS ARE ALSO THREATENED BY HIGH
WATER.
...FORECAST FLOODING INCREASED FROM MODERATE TO MAJOR SEVERITY...
THE FLOOD WARNING CONTINUES FOR
THE BIG SIOUX RIVER ABOVE HAWARDEN.
* UNTIL FURTHER NOTICE.
* AT 09AM MONDAY THE STAGE WAS 25.12 FEET.
* MODERATE FLOODING IS OCCURRING AND MAJOR FLOODING IS FORECAST.
* FLOOD STAGE IS 20.50 FEET.
* FORECAST...THE RIVER WILL CREST NEAR 29.6 FEET BY THURSDAY MAY 30
THEN BEGIN FALLING.
* AT STAGES NEAR 30.5 FEET...IOWA HIGHWAY 10 BEGINS TO FLOOD.
Instructions:
Please drive with caution
Address/Location
Sioux County Sheriff's Office
4363 Ironwood Ave., Ste 1
Orange City, IA 51250
Contact
Emergency: 9-1-1
Non-emergencies: 712-737-3307